In the figure given below AB is the production-possibility curve of Canada. In the absence of trade, the price ratio is 1 bushel of wheat/bale of cotton as shown by the line PQ. The international price ratio is 0.25 bushels of wheat/bale of cotton as shown by the line RS. I 1 and I 2 are the pre-trade and the post trade community indifference curves of Canada respectively. In the absence of international trade, 1 bushel of wheat will exchange for _____ bale ( s ) of cotton in Canada . After Canada engages in international trade , 1 bushel of wheat will exchange for _____ bale ( s ) of cotton . Wheat (bushels) C otton (bales) Canada C 0 C 1 S 1 S Q 80 60 25 50 I 1 I 2 65 85 0 B A P R a. a. 1 ; 0.25 b. b. 4 ; 1 c. c. 1 ; 4 d. d. 0 ; 2.5